Inheritance
organized class structure to avoid repeating the same code
when starting a child classs, put the parent class name in brackets
super().init()
overriding a parent class method by defining a function with the same name.
Method Overriding
Redefining a parent's method in a child class to change its behavior
-ex-
class MedicalStaff:
def init(self, name, department):
self.name = name
self.department = departmentdef
def introduce(self):
return f"hello. I'm {self.department} {self.name}"
class Doctor(MedicalStaff):
def init(self, specialty):
super. init(name,department)
self.specialty = specialty
def introduce(self):
return f"hello. I'm {self.specailty}{self.name}"
• only change from department to specailty
File I/O is required
open() - Open the file, check the mode and decide what do we do
basic: file = open('file name.txt', 'mode', encoding='utf-8') and file.close()
c'file close' is very important !!!
w= write , r= read, a = add, r+ = read and write, utf-8 = korean
Using with is safer than not using it.!
- ex -
😒
patient_file = open('patient_info.txt', 'w', encoding='utf-8')
patient_file.write('patient info')
patient_file.close()
😊
with open('patient_info.txt','w',encoding='utf-8') as file:
file.write('patient info')
exception handling
try - except
- ex -
try:
-> Error-prone code
except:
->Catch every error
print(' A error occurred')
finally block: this code always runs without any errors
except ZeroDivisionError:# key = 0
print('height is bigger than zero')
except ValueError:# when enter str, instead of int
print('only enter numbers')
except Exception as e:# unexpected error
print(f"an error occured: {e}")
finally:
print('ending the bmi calculate')
print('record in the system log')
more ~~## FileNotFoundError - no exist
PermissionError - reject permission
ValueError - value is wrong
IsADirectoryError - try opening folder instead of file
UnicodeDecodeError - read wrong encoding
OSError - error about OS
IOError - IN/OUT General error
